Control-box



G. W. BUNGAY.

CONTROL BOX.

APPLICATION FILED AUG.30. I916.

1,309,61 1 Patented July 15, 191$).

2 SHEETSSHEET I,

jgz.

I/WE TOR G. W. BUNGAY.

CONTROL BOX.

APPLICATION FILED AUG.30, ms.

1,309,6 1 1 Patented July 15, 1919.

2 SHEETS SHEET 2.

[g r w r 319 INI/ENTOI? MC}, 4 5 5 ATTORNEY other elastic fluid under pressure.

UNITED STATES PATENT OFFICE.

GEORGE WALDEMAR BUNGAY, OF BROOKLYN, NEW YORK, ASSIGNOR T0 ACME DIE CASTING CORPORATION,

A CORPORATION OF NEW YORK.

cou'rno -Box.

Patented July 15, 1919.

Application filed August 30, 1916. Serial No. 117,596.

To all whom it ma concern:

Be it known that I, GEORGE WALDEMAR BUNGAY, a citizen of the United States, residing at the borough of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Control-Boxes, of which the following is a specification, reference being had therein to the accompanying drawings, forming part thereof.

My present invention relates to an improved form of controller for use in connection with apparatus actuated by steam or My improved controller is useful in connection with any apparatus wherein a plurality of steam pistons or equivalent devices are employed to actuate or impel ments of such apparatus in a given order; and the principal object and function of my improvement is to provide means whereby the requisite movements of such steam pistons, etc., may be produced with certainty in their proper order. My improved controller makes it possible to attain these ends by the simplest possible manual operation, andwithout any risk or accident due to careless or inattentive operation. 1

While my improvement, as claimed, is capable of application variety of devices, made as above characend or the other of the cylinder within which the piston moves. One of these pistons acts in one direction toclose the mold and place it in connection with the conduit through which the molten metal is delivered, while movement of said piston in the opposite direction opens th mold and discharges the molded article. piston acts, when moving in one direction, to force molten metal into the closed mold;

different parts or ele-' are done away with,

to any of the great No. 54,123, and which be- The second and, when the steam is reversed with respeet to this second piston, the same is lifted into a position of idleness, awaiting the next operation.

It will be clear that each end of each steam cylinder must be capable of receiving and discharging the working fluid, and in my said pending application the inlet and exhaust of each end of each cylinder are controlled by rotary valves close to their respective cylinder ends. Appropriate successive action of these valves is produced by a specially constructed safety controllerhandle, connected mechanicall to two rocking shafts at opposite ends 0 the machine. Manipulation of the controller handle is somewhat complicated, and means are pro vided for preventing any accidental or careless movement of such controller which might result in operating the various parts of the machine in improper order.

By the use of my present invention, the moving arms, rods and; shafts employed to convey movement to the four separate valves and the control of the working fluid is accomplished within a single controller box governed by a single swinging handle, whence pipes convey the fluid to and'from the two ends of the two cylinders.

The special embodiment of my invention above referred to is illustrated in the accompanying drawings, wherein Figure 1 is a side elevation of my controller box with one-half of the side removed, the better to show the interior; Fig. 2 is a section of the same on the line 22 in Fig. 1; Fig. 3 is a section on the line 3-3 in Fig. 2; Fig. 4 is a section on the line 1-4 of Fig. 2; Fig. 5 is a section on the line 55 in Fig. 2; and Fig. '6 is a perspective view of a preferred arrangement of cams and their shaft.

. I shall describe the apparatus herein illustrated in its application to my die casting iiiachine aforesaid, and it is to be understood that this description merely exemplifies the possible embodiments of my invention.

The working parts of my improved controller are contained within an outer box or casing 10, which may be fastened in any desired position to the fire box or other part of my die casting apparatus, erably so that the working handle 11 stands upright. This casing is divided by the partition 12 into a cam chamber and a valve and conduit chamber. The valve and conduit chamber is further divided as follows:

Looking into the valve and conduit chamber from the direction of the handle 11, as

,in Fig. 2, it will be seen'that a portion of the upper right hand corner is divided off to form a steam inlet chamber 13 which extends unbroken from end to end 'of the outer casing, as shown in Fig. 3. Live steam is led to this inlet chamber through the pipe 14.

At the lower left hand side of the valve and conduit chamber is shown the exhaust chamber 15, which also extends unbroken the full length of the casing, as shown in Fig. 4. The exhaust steam leaves by the pipe 16. I

The remainder of the space within the casing 10, above the partition 12, is divided by unbroken cross partitions 17, 18 and 19 to form four separate and distinct passages or pockets, which open at the top of each into the respective pipes 20, 21, 22 and 23. The four puppet valves 24, 25, 26 and 27 open into the common inlet chamber 13, and these valves therefore command inlet of steam into the four pipes 20, 21, 22 and 23 respectively, as will be clear from inspection of Figs. 1 and 3. These inlet valves are lifted in a manner hereinafter described by means of the lifting stems 28, and are held down to their seats both by steam pressure and by springs 29 bearing upon washers 30 fixed on said stems.

The exhaust returning from the pipes 20, 21, 22 and 23 is controlled by similar puppet valvesshown at 31, 32, 33 and 34 respectively, and these exhaust valves are lifted by the stems 35 normally held down by springs 36, bearing upon the washers'37.

As has already been explained, the inlet and exhaust valves must be operated in pairs corresponding to the respective pipes 20 to 23, and the inlet valve for each pipe should be opened at the same moment that the exhaust valve for the other pipe of the pair is opened and vice versa. In order to accomplish this simultaneous movement of the members of each pair by compact and reliable means of a simple character, I prefer the following construction.

Midway between the parallel planes de termined by the two sets of parallel valve stems, and running from end to end of the casing 10, I place a rotary cam shaft 38,

operated, by the exterior handle or crank 11. Placed parallel with the shaft 38, and symmetrically placed above the same and on opposite sides of the lower division of the easing 10 are two spindles 39 and 40 which af ford bearings for the eight valve levers. Of these last named elements, the levers 41, 42, 43 and 44 are supported at their extremities by the respective cams 5, 46, 47 and 48 and and 34. They are suitably spaced by means of the thimbles 58. One side of the end of each of the valve levers is cut away so that they may overlap and make contact with parallel cams beneath'them, while permitting, the valve stems to rest opposite each other in common transverse planes; thus preserving the symmetrical arrangement of the corresponding inlet and outlet valves in each'pair. This is clearly shown in Figs. 2 and 5.

The number of pairs of valves and their corresponding leading-oft pipes will depend upon the number of steam cylinders and pistons to be appropriately controlled in any given mechanism. I have herein shown four of each, corresponding to the two ends of the piston closes and opens the mold, the pipe 21 as leading off tov the bottom of the same; while the ipes 22 and 23 lead off respectively to the top and bottom of the metal pumping cylinder.

In the specific arrangement of cams which I have illustrated in the drawings, I have provided for the necessary successive operations to be brought about by a single forward and backward movement of the handle 11, whereby rotation through a half circle is accomplished, first in one direction and then in the other. It will be seen that each pair of cams includes one short-faced or peaked cam and one long-faced-or extended rounded cam; and that these are placed in diametrical opposition. Otherwise'expressed, each of the cams 45, 55, 47 and 57 is "provided with a valve-closing dwell, while each of the cams 54, 46, 56 and 48 is provided with both a valve-opening dwell and a valve-closing dwell of which the valveopening dwell is the longer, whereby one of the valves of each pair will be held open while the other is kept closedand then will be kept closed while the other is opened and closed. This opposition results from the fact that, in any given position, the opening of an inlet valveinto a. given leading-off intended.

When the machine is idle, and mreadiness for use, the inold is open and the metal pump-ingv plunger is raised. This condition is preserved by the normal position of the contrloller, when the line of contact with the valve lovers will be as represented *by the uppermost dotted line in Fig. 6. In this position the inlet valves 24 and 27 are open,

as are the exhaust valves 32 and 33. All

the others. are closed (see Figs. 3 and 6).,

Consequently steam is admitted to,the top of the mold-controlling piston, thus holding the mold open, and to the bottoml'of the pump piston, thus keeping the plunger idle.

The first operation is to close the mold, without operating the pump. To lfdo this the handle is turned ninety degreesyoi' until the line of contact is as representedby the middle dotted line in Fig. 6. The extended curve of the rounded long-faced cams 56 and 48 has preserved the original condition so far as to keep the valves 33 and 27-- open; and the closed position of the valves., 26 and 34 is maintained by reason of the fact that the movement described does not,' .as yet, bring the peaked or short-faced camsl47 and 57 into action. In other words, the two pairs of cams at the right in Fig. 6 preserve the original positions of the valves which communicate with the pipes 22 and 23, leading to the top and bottom respectively of the pump piston. At the same time the other two pairs of cams, governing the operation of the mold-controlling piston produce a complete change in their corresponding valves, and we now have the pipe 20 in communication with the exhaust, while the pipe 21 receives a supply of live steam. Consequently the mold controlling piston will be lifted, and the mold will be closed in position to receive the molten metal.

- I The next operation will be to pump the metal into the mold. To do this the pump must be operated while the mold-controlling mechanism remains immobile. This is accomplished by completing the half circular movement of the handle 11, thus bringing the line of contact into the position represented by the lowermost dotted line in Fig. 6. Inspection of that'figure will show that the left hand set of pairs of cams maintains I the valve relation produced in the position last above explalned, while a complete change is produced in the pump controlling valves governed by the two pairs of cams at the right of Fig. 6. The result will'be that steam will be admitted to the top of the pump piston, to force down the pump plunger, while the closed position of the mold is firmly maintained .by the steam pressure under the piston controlling the same.

When the mold is filled, the handle is simply brought back to its original position, re-

producing the positions above described inreverse order, whereby the pump plunger is Y first lifted and kept lifted, and the mold is then opened.

In view of the fact that the valve-operating cams are made in symmetrical halves, the operating handle 11 may be moved in either direction, half way around and back again or, if, desired, it may be successively .moved through two half rotations in. the

same direction to make one complete rotation, in either direction. However, it has been found most convenient to movethis handle through the front half of the circle, half way around and back, and the valveoperating action of the cams hereinbefore described has reference to such movement of the handle 11 It is not'essential to my invention that the cams be arranged for operation by the halfcircular motions described, since it is obvious that a different movement might be employed. It is also clear that the cams in each pair might be made to work in constant mutual opposition without setting them 180 degrees apart as shown; and in my claims this broader view of the opposition of'the cams is meant, where that expressionis employed.

The controlling means of my present invention has been embodied in the die-casting machine forming the subject of my copending application for patent Serial No. 163,406, filed April 20, 1917, which became Patent No. 1,279,650, dated September 24, 1918.

It is obvious that various modifications may be made in the construction shown in the drawings and above particularly described within the principle and scope of my invention.

I claim:

1. Means for OOIlItIOlllIlg a plurality of 'vldual cams in each pair being set in opposition to each other, and corresponding cams in the two pairs beingset in corresponding operating positions, and means for operating sald cams.

2. Means for controlling a plurality of u ed and vrounded lifting surface set in opposition to the peak of its companion, and means for revolving said cams.

3. Means for controlling a plurality of double-acting pistons comp-rising in combination a pair of leading-ofi' pipes for the two sides of each piston, inlet and exhaust valves arranged in pairs for each leading-oil pipe;

aset of two pairs of cams for each two pairs of valves, the two outer cams of each set I of four being peaked and the companion of each being set in opposition thereto and having an extended rounded lifting surface,

and means for revolving said cams.

4. Means for controlling a plurality of double-acting pistons comprising in combination a pair of leading-ofl' pipes for the two sides of each piston, inlet and exhaust valves arranged in pairs for each leading-oil pipe, a set of two pairs of cams for each two pairs of valves, each set of four cams comprising two peaked and two rounded and extended cams set. in opposition to said peaked cams and the extended cam surfaces in one set overlapping those in the next set, and

means for revolving said cams.

Means for controlling aplurality of double-actingpistons comp-rising in combination -a pair of leading-oil? pipes for the two sides of each piston, inlet and exhaust valves arranged in pairs for each leading-off pipe, a set of two pairs of cams for each two pairs of valves, one'cam of each pair being peaked and the other having an extended and rounded lifting surface set in opposition to the peak of its companion, and the cams being arranged to control inlet and exhaust valves alternately, and means for revolving said cams. v

6. Means for controlling a plurality of 1 double-acting pistons comprising in combination a pair of leading-01f pipes for the two sides of each piston, inlet and exhaust valves arranged in pairs for each leading-off pipe, a set of two pairs of cams for each two pairs of valves, one cam of each pair being peaked and, the other having an extended and round ed lifting surface set in-opposition to the peak of its companion, and the peaked cams in one set being set in oppositlon to those in the next set, and means for revolving said cams.

7. Means for controlling the admission and exhaust of Working fluids to and from engines operated thereby, comprising in combination a casing divided into two main chambers by a partition, valves located in one of said chambers, actuating means for said valves located in the other of said chams bers, and operative connections traversing 1 chambers by a partition, valves located in v one of said chambers, rotary cams in the other chamber and lifting stems controllable by said'c'ams, attached to said valves and ex tending through said partition, said cams including short-faced cams and long-faced cams arranged in groups, the short-faced cams inone group being arranged in oppositionto the long-faced cams in the same group and so as to correspond in operating position with the long-faced. cams of another group, and means for concurrently operating all of said cams.

9. Means for controlling the admission and exhaust 'of working fluids to and from engines operated thereby, comprising a casing having an unbroken longitudinal inlet chamber, a similar exhaust chamber and an intermediate chamber divided transversely into conduits, an inlet and an exhaust valve between each of said conduits and said inlet andexhaust chambers respectively, and means for actuating said valves in suitable order. v v

10. Means for controlling the admission and exhaust of working fluids to and from engines operated thereby, comprising a casing having a space for valves and conduits, parallel longitudinal chambers within said space and on opposite sides thereof, inlet 11. Means for controllingthe admission and exhaust of working fluids to and from engines operated thereby, comprising a casing having parallel longitudinal chambers on different levels and opposite sides, conduits connecting the under side of one chamber with the topof the; other, valves under one chamber and over the other in each conduit and means for opening and closing said valves in appropriate order.

12. Means for controlling the admISSIOIi and exhaust of working fiuids to and from engines operated thereby, comprising a casing having parallel longitudinal chambers on different levels and opposite sides, conduits connecting the under side of one chamber with the top of the other, valves under one chamber and over the other in each conduit said valves having parallel descending lifting stems, a rotary shaft beneath said stems, cams thereon corresponding to said stems, and pivotally mounted valve levers bearing on said cams and supporting said stems.

13. A fluid controlling device comprising a valve chamber having therein a series of pockets, a fluid-conveying conduit connected to each pocket, an inlet valve for each pocket, an exhaust valve for each pocket, and valve-operating means for opening and closing the inlet and exhaust valves for each pocket in alternate relation and adapted to cause one of these valves to dwell at the open position while the other is kept closed and to dwell at the closed position while the said other valve is both opened and closed.

14. The invention claimed in claim 13 in which the ockets are arranged in pairs and in which the valve-operating means are adapted to open or close the inlet valve of one of the pockets of a pair concurrently with the opening or closing of the exhaust valve of the other pocket of the same pair.

15. The invention claimed in claim 14 in which the valve-operating means, com rise anequal number of short-faced and ongfaced cams arranged in groups so that the short-faced cams in one group correspond in operating position with the long-faced cams in another group.

16. A fluid-controlling device comprising a valve chamber having an inlet assage extending from end to end thereof, an outlet passagelikewise extending from end to end the pockets of the valve chamber, and a series of pockets each communicating with the inlet passage and with the outlet passage; a ing conduit communicating with each pocket, a series of inlet valves controlling communication between the inlet passage and the respective pockets, a series of exhaust valves controlling communication between the respective pockets and the exhaust assage, and valve-operating means adapted to open and close the inlet and exhaust valves for each pocket in alternate relation.

17. The invention claimed in claim 16 in which the pockets are arranged in pairs and in which the valve-operating means comprise an equal number of short-faced and long-faced cams arranged in groups so that the short-faced cams in one group correspond in operating position with the longfaced cams in another group, and are adapted to open or close the inlet valve of one of of a pair concurrently with the opening or closing of the exhaust valve of the other pocket of the same pair, and the short-faced cams in one group being arranged in opposition to the long-faced cams in the same group.

18. A fluid-controlling device having, in combination, an inlet valve, an exhaust valve, and valve-operating means for opening and closing the inlet and exhaust valve in alternate relation and adapted to cause one of these valves to dwell at the open position while the other is kept closed and to dwell at the closed position while the said other valve is both opened and closed.

In testimony whereof I have afiixed my signature.

, GEORGE WALDEMAR BUNGAY.

Witnesses:

CHARLES G. GOLDMAN, EDWIN N. Wow. 

